I used it a few years back and it worked well. It takes some getting used to because of all the relationships. There was a reason I stopped - I think (I really can't remember) that the program moved all of your files into its own folder. I didn't like that so I stopped. Don't know if the current version does that or not.
The concept is great for non-linear thinkers. It really enables you to have multiple access points to your files.
Hope this helped (a little) and didn't confuse.